Surrounding Air Temperature Derating, Ip21 (Ul Type 1) - ABB ACS580 Series Hardware Manual

No derating needed for 35 °C ambient temperature.
Referring to I in the ratings tables (starting from page 272), drive type
LD
ACS580-01-026A-4 exceeds the I

Surrounding air temperature derating, IP21 (UL Type 1)

IP21 (UL Type 1) drive types, other than the exceptions below
In the temperature range +40...50 °C (+104...122 °F), the rated output current is
derated by 1% for every added 1 °C (1.8 °F). The output current can be calculated
by multiplying the current given in the rating table by the derating factor (k, in the
diagram below).
k
1.00
0.95
0.90
0.85
0.80
...
-15 °C
+5°F
IP21 (UL Type 1) drive type -078A-4; -099A-6, -125A-6, -144A-6
-078A-4: In the temperature range +40...45 °C (+104...113 °F), the rated output
current is derated by 1% for every added 1 °C (1.8 °F). In the temperature range
+45...50 °C (+113...122 °F), the rated output current is derated by 2% for every
added 1 °C (1.8 °F). The output current can be calculated by multiplying the current
given in the rating table by the derating factor (k):
k
1.00
0.95
0.90
0.85
0.80
0.75
...
-15 °C
+5 °F
Ld
+40 °C +50 °C
+104 °F +122 °F
+40 °C +45 °C +50 °C
+104 °F +113 °F +122 °F
requirement of 19.43 A.
T
0.85
T
Technical data 279